Bolt carrier came with the upper.. Someone is going to have to explain adjusting headspace on an AR, seems to be a common theme. Where is the adjustment? Shimming where the barrel mates with the receiver? I've put together over a half of dozen rifles, most with a bolt carrier that didn't come with the barrel or upper, never had an issue.

Last edited by Bankjob; 02-01-2014 at 05:36 PM.

Guns are a lot like parachutes ~ If you need one and don't have one, you'll probably never need one again